Laser direct writing of flexible multifunctional airflow sensors on the Kevlar fabric

Wei Wang^{¹^,³}

(), Zi-Qing Chen^², Yong-Qi Li^², Yu-Long Wang^², Mei-Chen Liu^¹, Yun-Bo Ruan^³, Yang Zhang^⁴, Shu-Juan Liu^²

(), Qiang Zhao^{¹^,²}

()

1College of Electronic and Optical Engineering and College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China

2State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China

3Zhe Jiang Topsun Logistic Control CO., LTD., Yuhuan 317600, China

4Department of Rehabilitation Medicine, School of Acupuncture-Moxibustion and Tuina and School of Health Preservation and Rehabilitation, Nanjing University of Chinese Medicine, Nanjing 210023, China

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The flexible multifunctional fire-resistant airflow sensor based on Kevlar fabric is reported here. With the help of simple direct laser writing method, the twice-vertical laser-induced-graphene is introduced to sense airflow direction and velocity from both two-dimensional (2D) and three-dimensional (3D) space in the presence of fire, implying the possibility of application in fire rescue. And the airflow sensor can be further extended to a multi-function platform including sensing glucose for subsequent rescue.

Abstract

The growing interest in flexible devices has emerged as a global trend due to their advantages in flexibility, lightweight structure, and wearability, addressing the limitations of traditional devices. While wearable airflow sensors have been previously reported, the development of flexible fabric-based airflow sensors capable of functioning in environments with open flames—critical for fire rescue operations—has yet to be explored, largely due to the poor fire resistance of conventional fabrics. In this work, we first present a flexible, wearable, and multifunctional airflow sensor with excellent fire-resistant properties, fabricated through a simple direct laser writing process. This sensor maintains airflow detection capabilities even in the presence of open flames. Typically, the fabrication of fabric-based sensors involves complex procedures such as carbon materials doping or vapor-phase deposition, leading to lengthy preparation cycles and high costs. Furthermore, fabric-based devices are inherently prone to flammability. To address these challenges, we introduce twice-vertical laser-induced graphene (TVLIG) as a sensitive and reliable component for fire-resistant airflow sensors. The resulting TVLIG/Kevlar fabric can be integrated into various garments, particularly protective suits, to form sensitive and fire-resistant airflow sensors capable of detecting airflow velocity and direction in both two-dimensional (2D) and three-dimensional (3D) spaces during fire incidents. Additionally, the TVLIG patterns can be expanded to multifunctional platforms, such as glucose detection for injured individuals, offering further applications in rescue operations. This functional expansion reduces the burden on rescue personnel and streamlines device preparation. With its outstanding sensing capabilities, fire resistance, and expandability, the developed flexible airflow sensor shows great potential for various real-world rescue scenarios, promising advancements in wearable sensing technology for rescue engineering.

Keywords

flexible airflow sensor direct laser writing twice-vertical laser-induced graphene fire accident rescue Kevlar fabric

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References

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